Lens-grinding machine.



A. A. ROUSSEAU. LENS GRINDING MACHINE. APPLIQATION FILED SEPT. so, 1912.

Patentd Aug-12, 1913.

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2 SHBBTS-SHEET l.

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WITNESSES A. A. ROUSSEAU.

LENS GRINDING MACHINE.

APPEIOATION FILED SEPT. so. 1912.,

Patented Allg. 12, 1913.

2 SHEETS-SHEET 2.

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si citieiio iie Unieci Stoes vs Comme/ece street., ilie coiiny Dalias and Seme of exe inive invented oeiein new emi usefiii in.

Lens-Grinding Machines, oi which the foiicvving is a specification.

My invention miete-s 'eo new and useful.' impoveinenis in lens Q'in'ii, J ond. its obiecs is se provide e. nien-inne which tliougii e siinpie substitution be einpioyei 'fo .Orin' 7 sort oi'' cyiinei cone-eve.

Liiioihei' of. 'i

the lens Twiiicl.. is being; vgrinding icoi.

TiTiili these veiios ohei objecs in View, my in'veniion nas ieietion io ceitein novei features of ldie consir'uciioii and opeetion, an example o which is describedl in the following speciiicetion, emi iilustrailed in the ecconipenying drawings, wherein: I

Figure l is o top view of the bese upon which the operating mechanism of elle inecliine is mounted, the covei poi-tion of the machine not being shown 'in ibis view. Fig'. 2 is transverse sectional View of die complete machine, the section beine" teken closelgr ecijeceni co one entieiniy Vci@ fie me,u v chine. Fig. 3 isl longitudinei veicci sectional view of the machine; the section being teken ciosely ocijacent tothe front Well oi the machine casing. Figs. i end 5 are respectively a iop and freni view of an ec-" centric crank bearing; several of which eie embodied in the mechanism of the machine. Figs. 6 and 7 are i'espeetively e longitudinal sectional View and e top vienY of e mechanism for holding o lens during the process of grinding the same, the means for reciprocating the ,seine beingwalso shown. Figs. @emi 9 eie respectively e side en top e 'looi supp iiing oer showing ehe mechanism for communicating e lrecipe@-` eeing nioion to seid bei'. Fig. iii is e de vei'iicel sectionaivievv t#maken upon ,ne iiiie lil-X of Fig. 3, this view showing-"ine ioci euppoiing oei-with one of the grinding tools ust guaio coifieieied ivijlif'soil peri'. Fig. il' is e detail view snowing *iie mechanism foi' exei'eing o consten"y picessine upon *the lens hoiing mim, showing @isole device for releasing seid. erin i'om its cfg erezive posiiion,

iriiv iv move perticuieiiy ilo ehe "s, Wiieiein iiiie reference clneeecieis W sind i the F *iiies lie m .c alie meenemen@ el if; moiineii Within e "forni/eci in tivo helvem i Figr 5.-

iieii of the disk 8 is i rovizieii tivo hey-Ways Si and the journal poriion of each crank 5 is provided with 'two fiieineiiceiiy opposite 'keys Si adapted 'no eneei' en opposite pei? ofv the key-ways Each two per@ ciisk 8 is ioziiebiy mountecl in e suioloie beeifing" pi'c viceeii upon ine correiete extremity of eicli pinnen 7. mounting the ciis'ls` 8 in vei'ious posieions ci enguiei' ojiismeu relative ilo the joui-nei portion. oi? the con related crunk, it is mede possible to secure a.. fieiiczie edjiis'ixnent in the length oi' the siiokes of each iecipi'oceing bei' 6. Each of the recipiocaiing bars S is provide; with e longitudinal s'lot 9 into which there projects e guide block l0 supported from beneath by e pair of standards 1l. The two standards' li supporting each block 10 rest upon lie uoase 1. The fbese is provided with e cover 11L which is sufficiently eievafed sioove the mechanism so fer described as to clear the Seme. The cover 11a' is supported in en elev'eied position by igiene, basl; enel enel. Weils, the "lower edges of whiclurest upon e seat 11 'extening about the rim of the Eoose'. Each bioel l0 is sumounte by 6 are parallel and extend 'forwardly' at right angles to the crank shaft 2 is clearly shown in F l oi" the drawings. The 'foin ward extremity oi each bar 6 is connected through a hinge joint 13 with an arm lai.,

1o which arm, in its normal position, is alined with the correlated bar 6. r`he forward portion ot' each arm 14 is arched as indicated zit-:15, and a downwardly projecting pin 16 is mounted at the center or highest point of l5 the arch centrally apertured disk 17 is adapted to be mounted wit-hin the recess formed by the arched portion of each arm The lens in its rough or unground form is secured to `the under upon the pin 1G 2o face oi.E the disk 1'? by cement or any other suitable means, as indicated by the numeral 17a in Fig. 6.

A description wili now be given of the means .employei'l 'for holdingthe grinding tool and for comn'iunicating a reciprocating motion to the same. A shaft 18 is mounted at right angles to the shaft 2 in a pair of bearings 19 secured to the base l, said shaft being adapted to receive rotation from the j shaft 2 through a pair oi intcruicshed bevel gears The "t'cawvard extremity of thc shaft 18 is Ajn'ovided with a crank arm 21 l to coinnuuucate a recipro which is adapter eating motion to a 'nar 22 through pitman 23. The bar 22 is parallel and adjacent to the front edge of the base l and extends across an aperture 2l extendingI into the base l from the front coge thereof. At each side of the aperture 24- a slide bearing 25 is e0 mounted upon the base i to receive the re? ciprocating'bar 22. l support t'or two grinding tools oi mushroom .The bar 22 furnishes a shape, the head 26 of each tool being somewhat elongated in one direction,l this elongated dimension being made parallel to the bar 22 when the tools are operatively mount- Each tool is provided with a downwardly projecting shank 2? fitting into a suitable socket provided in the bar The space intervening between the 'two Igrinding tools 26 is equal to the space exist ing between Ithe two reciprocating bars G, and the relation of the parts is such that when the bars 6 and bars 22 occupy positions intermediate of `their reciprocating stroke, the center points of the lenses secured to the blocks 17 a will have contact with the center points of the grinding tools 26. The

indirrg tools are restricted from vertical isplacement relative to the bar 22 by horizontal pins 28 passing through the bar 22 and partially recessed in ,the shank members 27. A metal dust guard 29 is correlated with the grinding tools 26, said guard being clamped between the bar 22 and thetool 26,

as is clearly shown in Fig. l() of the drawing.

A description will now be given of the mechanism employed to hold the lenses in constant contact with the grinding tools during the operation of the machine. Upon the top 11a of the cover adjacent to the front edge thereof, are mounted two brackets 30,

.the distance between said brackets being equal to that existing between the bars 6. 'Upon each bracket 3G is pivoted the lower extremity of an arm 3l, which arm during the operation of the machine occupies an upright position, as shown in the drawings, in full lines. Upon the lower extremity of the arm 3l is pivotally mounted the apex ot' a forwardly projecting bell-crank comprising an upper arm 32 and a lower arm 33. The free extremity of the arm carries upon itsv under surface two spaced recesses 34, either one of which may be brought into engagement with a horizontal pin 35 carried by a bracket member 36 mounted upon the .toot of the bracket 30. When the uppermost of the two recesses 34 engages the pin 35, as is shown in full lines in the drawings, th.: arm 31 will occupy an upright position. When the lowermost recess 3a engages the pin 35, the arm 3l. will be inclined reai-, wardly at au angle with the vertical, as is ings,

Upon the upper vextremity of the arm Sl is mounted a forwardly projecting arm 237v which is adapted to be adjusted in various positions with relation to the arm 31 by means of a set-screw 38. Between the free ends of the bell-crank arm 32 and the middle portion of the arm 37, a rod 39 is extended, the extremity of said rod bcmg pivotally connected to the arm 32, and the upper eX- tremity of said rod being free. to slide in the aperture in the bar 3'? through which said rod passes. Upon the rod 39 is mounted a coiled spring 40 having its extremities respectively abutting against the arm 37 and the bell-crank arms 32 The downward pressure exerted by the spring t() upon the lree end of the arm 32 serves to impress an impulse toward downward motion upon the bell-crankarm 33 and thereby prevent the recessed portion 34 of said arm from escaping from engagement with the pin 35. The upper bell-crank arm is provided with an upwardly projecting 'handle member 41, which, when subjected to rearwardly acting pressure, produces a rotation ot' the bellcrank about its pivotal support and serves to free either recess 34 from engagement with the pin 3 5.` Between the forward er;e tremities of the arm 37 and the arm 14, a rod 42 is extended, said rod haying its lower end pivot'ally connected with the arm 14 and its upper extremity adapted to undergo a sliding displacement through the free end of Yshown in dotted lines in Fig. '1l of thc drawper Inosa-sie the arln `Upon the rod 4Q is mounted 'a coiled spring'. 43 having its upper and lower v extremities respectively bearing against the ings are so formed ,sure exertedthereuliion ,jected to a reciprocating arms 37 and 14. Since in the operative position of the mechanism, the arm 37' is rigidly maintained in a horizontal position, said arm normally will not yield to the presby the spring 43 and the torsion of this spring, therefore, is eX- tended in` producinga downwardly acting impulse upon the arm 14, owing to `which impulse the lense correlated with said arm will be held in a constant firm contact with the correlated grinding tool 2G.

4The grinding tools 26 .hown in the drawl as to produce concave or minus cylinder lenses, but it is, ofcourse, to be understood that the machine may be employed to form convex cylinder lenses by substituting a grinding tooll of a suitable form. The'arms 6 will'preferably be submotion three times as rapid as the motion which is communicated to the arm 2Q, it having beenv found that these relative motions of the partsv specified serve to produce the most satisfactory results. In order to prevent expansion of the spring 43 when the parte correlated therewith occupy the position shown in dash lines in Fig. ll, a flexible' strap 44 is ex tended between the two arms le and 37.

The dash line construction illustrated in Fig. il shows the position occupied by the mechanism' for exert-ing Ydownward pressure upon the lens, when said mechanism is not in use.

The invention is presented as including all such modifications yand changes as properly come within the scopeof the followingY claims.

l What I claim is:

l. In a lens grinding and polishing machine, the combination of, .a base, a work support, a tool support, said supports reciprocating over the base at right angles to each other, a tool mounted on the too support, a work carrier hinged on the Work support overthe tool, a member supported in hinged relation to the base, an arm mounted on the hinged support, and a resilient connection between the arm and the hinged work carrier.

2. In a lens grinding andpolishin'g machine, the combination of, aA base, a work support, a tool support, said supports reciprocating over the base at right angles lo each other, a tool mounted in the tool su port, a work carrier hinged on the wor support over the tool, a member supported in hinged relation to the base, an arm mounted on the hinged support, a resilient connection between the arm and the work carrier, and a vspring 'held latch connected to the arm and arranged to lock the same in adjusted posit-ions.

3. The combination in a lens grinding and polishing machine, of a base, a main crank shaftzm'ounted on the base; a counter crank shaft mounted on the base at right angles to the main shaft, a work member connected to the main shaft, a work the end of the work member, an arm hinged over the base, a resilientconnection between the arm and the hingedworlt carrier, a tool carrier connected to the counter shaft, a tool mounted on the tool carrier under the work carrier, and a gearing connection between the two shafts.

In testimony whereof I have' signed my name to this specification in the presence of two subscribing witnesses.

ALMER A. ROUSSEAU.

Vitnesses CALME MORGAN, J. S. MURRAY.

carrier hinged on I 

